Flatfoot is classified as having the entire sole of the foot in contact or near contact to the ground while standing. The disorder is also known as fallen arches, because those affected have no arch in their feet. Flexible flatfoot and rigid flatfoot are the two types of flatfoot.

A person has flexible flatfoot if when sitting or standing on their toes, they have an arch that disappears when they stand with the entire foot on the ground. Flexible flatfoot may also be called “pediatric flatfoot” because the condition first appears in childhood. It is common among infants because the arch does not develop until the age of 5 or 6 years. Rigid flatfoot is not as common in children as it is with adults. This type of flatfoot is developed due to the weakening of tibialis posterior muscle tendon, a major supporting structure of the foot arch. Development of this deformity is progressive and shows early signs of pain and swelling that begins at the inside arch of the foot and moves to the outside of the foot below the ankle. More severe cases can possibly lead to arthritis of the foot and ankle joints.

Although most cases of flatfoot involve people born with the condition, some less common causes are obesity, diabetes, pregnancy, and osteoporosis. In some cases, flatfoot may come with no symptoms at all and does not require any type of treatment. With other cases though, symptoms may include pain in the shin, knee, hips and lower back. If a person with flatfeet experiences such symptoms, a health care provider may suggest using orthotic devices or arch supports, which may reduce the pain. Wearing supportive shoes can also prove more comfortable with flatfeet and staying away from shoes with little support such as sandals. Other methods to relieve pain also include stretching the Achilles tendon properly and using proper form when doing any physical activity. In addition, losing weight can reduce the stress on your feet and reduce the pain.